JPS55113539A - Injection molding - Google Patents
Injection moldingInfo
- Publication number
- JPS55113539A JPS55113539A JP2070879A JP2070879A JPS55113539A JP S55113539 A JPS55113539 A JP S55113539A JP 2070879 A JP2070879 A JP 2070879A JP 2070879 A JP2070879 A JP 2070879A JP S55113539 A JPS55113539 A JP S55113539A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- cavity
- injected
- valves
- injection
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
PURPOSE:To provide a desired uniformed or ununiformed sandwich structure by a method wherein a compressed gas is forced into a mold cavity and the gas outflow speed is regulated, in advance to the injection of a synthetic resin. CONSTITUTION:A compressed gas is forced into a mold cavity through solenoid change-over valves 8, 8', flow control valves 7, 7', conduits 6, 6', and grooves 5, 5', before a first synthetic resin is injected into the cavity. With the valves 8, 8' closed during injection step, the gas pressure in the cavity increases as the injection of the first resin proceed, and the resin is injected preferentially towards the regions of lower gas pressure, so that the resin flows uniformly to both upper and lower regions of the cavity. Therefore, with the valves 8, 8' opened and second synthetic resin injected upon completion of injection of the first resin, there is obtained a uniform sandwich structure. When a ununiform structure is desired, the first resin can be injected ununiformly by providing a gas pressure difference between the upper and lower regions of the cavity.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2070879A JPS55113539A (en) | 1979-02-26 | 1979-02-26 | Injection molding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2070879A JPS55113539A (en) | 1979-02-26 | 1979-02-26 | Injection molding |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55113539A true JPS55113539A (en) | 1980-09-02 |
Family
ID=12034639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2070879A Pending JPS55113539A (en) | 1979-02-26 | 1979-02-26 | Injection molding |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55113539A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4432928A (en) * | 1981-05-14 | 1984-02-21 | Imperial Chemical Industries Plc | Process of moulding filled curable compositions |
JPS62231715A (en) * | 1986-04-01 | 1987-10-12 | Eng Plast Kk | Method for injection molding non-compatible series polymer alloy resin molding |
EP0400135A1 (en) * | 1988-12-05 | 1990-12-05 | Robert E Carroll | Injection mold method and apparatus. |
US5458846A (en) * | 1988-12-05 | 1995-10-17 | Carroll; Robert E. | Method of injection molding |
US5558824A (en) * | 1994-05-23 | 1996-09-24 | General Motors Corporation | Gas-assisted plastics injection molding with controlled melt flow and method of controlling melt flow |
US5716560A (en) * | 1995-09-14 | 1998-02-10 | Icp Systems, Inc. | Gas assisted injection molding combining internal and external gas pressures |
US6294126B1 (en) | 1997-10-04 | 2001-09-25 | Battenfeld Gmbh | Process for controlling gas blanket extent in plastics injection molding |
CN113492494A (en) * | 2020-04-01 | 2021-10-12 | 瑞皇精密工业股份有限公司 | Improved structure of mold |
-
1979
- 1979-02-26 JP JP2070879A patent/JPS55113539A/en active Pending
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4432928A (en) * | 1981-05-14 | 1984-02-21 | Imperial Chemical Industries Plc | Process of moulding filled curable compositions |
JPS62231715A (en) * | 1986-04-01 | 1987-10-12 | Eng Plast Kk | Method for injection molding non-compatible series polymer alloy resin molding |
JPH0358568B2 (en) * | 1986-04-01 | 1991-09-05 | Ge Plastics Japan Ltd | |
EP0400135A1 (en) * | 1988-12-05 | 1990-12-05 | Robert E Carroll | Injection mold method and apparatus. |
US5458846A (en) * | 1988-12-05 | 1995-10-17 | Carroll; Robert E. | Method of injection molding |
US5643527A (en) * | 1988-12-05 | 1997-07-01 | Icp Systems, Inc. | Method of injection molding |
US5558824A (en) * | 1994-05-23 | 1996-09-24 | General Motors Corporation | Gas-assisted plastics injection molding with controlled melt flow and method of controlling melt flow |
US5716560A (en) * | 1995-09-14 | 1998-02-10 | Icp Systems, Inc. | Gas assisted injection molding combining internal and external gas pressures |
US6294126B1 (en) | 1997-10-04 | 2001-09-25 | Battenfeld Gmbh | Process for controlling gas blanket extent in plastics injection molding |
CN113492494A (en) * | 2020-04-01 | 2021-10-12 | 瑞皇精密工业股份有限公司 | Improved structure of mold |
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