FR2325490A1 - Magazining dwell pressures during injection moulding - using hydraulic circuit, to shorten cycles by concurrent plasticisation for the next shot - Google Patents
Magazining dwell pressures during injection moulding - using hydraulic circuit, to shorten cycles by concurrent plasticisation for the next shotInfo
- Publication number
- FR2325490A1 FR2325490A1 FR7529669A FR7529669A FR2325490A1 FR 2325490 A1 FR2325490 A1 FR 2325490A1 FR 7529669 A FR7529669 A FR 7529669A FR 7529669 A FR7529669 A FR 7529669A FR 2325490 A1 FR2325490 A1 FR 2325490A1
- Authority
- FR
- France
- Prior art keywords
- screw
- pressure
- mould
- plunger
- dwell
- 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.)
- Granted
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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/57—Exerting after-pressure on the moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
An ancillary hydraulic system for a screw injection moulding machine to maintain the packing or dwell pressure on the melt entering the mould, and allowing the screw to retract and plasticise more material concurrently with the dwell stage of injection. A conventional reciprocating a non-return valve. Downstream from the valve is a small side chamber contg. a plunger. The plunger is moved by a hydraulic ram on a variable pressure circuit interconnected with that for the ram for the main screw. The relative ram forces can be adjusted so that during mould filling with full pressure on the screw, (a) the plunger can be advanced sufficiently to completely purge the side passage but (b) at the end of the initial shot can be retracted to allow the screw to fill the side passage. The ancillary circuit can then be isolated to maintain a suitable mould packing dwell pressure via the ancillary plunger while the non-return valve remains closed to allow the screw to retract etc. The plunger cam pressure can be relieved to allow the tool to be opened and the moulding ejected without any pressure on the melt in the runners and mould gates. Esp. suitable for moulding crystalline or semicrystalline materials, viz certain polyolefins, to compensate for contraction within the material in the mould cavity. The packing pressure is readily set to optimum levels. Overall mould cycles are reduced significantly by performing plasticisation for one cycle concurrently with the dwell stage of the preceding cycle. There are no blind recesses in the flow paths in which moulding material could hang up and degrade.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7529669A FR2325490A1 (en) | 1975-09-26 | 1975-09-26 | Magazining dwell pressures during injection moulding - using hydraulic circuit, to shorten cycles by concurrent plasticisation for the next shot |
DK383876A DK383876A (en) | 1975-09-26 | 1976-08-25 | DEVICE FOR MAINTAINING PRESSURE IN AN INJECTION MACHINE |
DE19762639155 DE2639155A1 (en) | 1975-09-26 | 1976-08-31 | DEVICE FOR MAINTAINING INJECTED MATERIAL UNDER PRESSURE AND FOR LOADING A MOLD AND INJECTION MOLDING PROCESS |
NL7610245A NL7610245A (en) | 1975-09-26 | 1976-09-15 | A DEVICE FOR PRESSURIZING SPRAYED SUBSTANCE, AND A METHOD FOR SPRAY FORMING PLASTIC. |
BE170942A BE846589A (en) | 1975-09-26 | 1976-09-24 | PRESSURE MAINTAINING DEVICE FOR A PLASTIC INJECTION MOLDING MACHINE AND CORRESPONDING INJECTION MOLDING PROCESS |
LU75874A LU75874A1 (en) | 1975-09-26 | 1976-09-24 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7529669A FR2325490A1 (en) | 1975-09-26 | 1975-09-26 | Magazining dwell pressures during injection moulding - using hydraulic circuit, to shorten cycles by concurrent plasticisation for the next shot |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2325490A1 true FR2325490A1 (en) | 1977-04-22 |
FR2325490B1 FR2325490B1 (en) | 1979-03-30 |
Family
ID=9160537
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7529669A Granted FR2325490A1 (en) | 1975-09-26 | 1975-09-26 | Magazining dwell pressures during injection moulding - using hydraulic circuit, to shorten cycles by concurrent plasticisation for the next shot |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE846589A (en) |
DE (1) | DE2639155A1 (en) |
DK (1) | DK383876A (en) |
FR (1) | FR2325490A1 (en) |
LU (1) | LU75874A1 (en) |
NL (1) | NL7610245A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2406294A1 (en) * | 1977-10-13 | 1979-05-11 | Siemens Ag | DEVICE FOR THE MANUFACTURING OF MOLDED PARTS AND COATED AND SEALED ELECTRICAL COMPONENTS |
FR2407805A1 (en) * | 1977-11-02 | 1979-06-01 | Hedrich Vakuumanlagen Wilhelm | APPARATUS FOR FILLING ONE OR MORE MOLDS WITH A MOLDING RESIN OR OTHER SIMILAR LIQUIDS LIKELY TO BE MOLDED |
EP0077847A1 (en) * | 1981-10-28 | 1983-05-04 | Rolf Ditter | Injection-moulding apparatus for injection-moulding machines and/or injection-moulding tools |
FR2523506A1 (en) * | 1982-03-19 | 1983-09-23 | Emhart Ind | INJECTION MOLDING ASSEMBLY |
DE4224196A1 (en) * | 1992-07-17 | 1994-01-20 | Mannesmann Ag | Method and device for pressing injection molding compounds |
EP0656251A1 (en) * | 1992-06-30 | 1995-06-07 | KRUPP CORPOPLAST MASCHINENBAU GmbH | Method and apparatus for manufacturing objects from thermoplastic material by injection moulding |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL9301167A (en) * | 1993-07-02 | 1995-02-01 | Stork Plastics Machinery Bv | Method and apparatus for injection-moulding of plastic articles |
JP5535595B2 (en) * | 2009-11-25 | 2014-07-02 | 日精エー・エス・ビー機械株式会社 | INJECTION DEVICE AND RESIN INJECTION METHOD |
DE102012110825A1 (en) * | 2012-11-12 | 2014-05-15 | NKS GbR (vertretungsberechtigter Gesellschafter Magret Baukloh, 58540 Meinerzhagen) | Device for injection molding of plastic moldings |
-
1975
- 1975-09-26 FR FR7529669A patent/FR2325490A1/en active Granted
-
1976
- 1976-08-25 DK DK383876A patent/DK383876A/en not_active Application Discontinuation
- 1976-08-31 DE DE19762639155 patent/DE2639155A1/en active Pending
- 1976-09-15 NL NL7610245A patent/NL7610245A/en not_active Application Discontinuation
- 1976-09-24 LU LU75874A patent/LU75874A1/xx unknown
- 1976-09-24 BE BE170942A patent/BE846589A/en unknown
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2406294A1 (en) * | 1977-10-13 | 1979-05-11 | Siemens Ag | DEVICE FOR THE MANUFACTURING OF MOLDED PARTS AND COATED AND SEALED ELECTRICAL COMPONENTS |
FR2407805A1 (en) * | 1977-11-02 | 1979-06-01 | Hedrich Vakuumanlagen Wilhelm | APPARATUS FOR FILLING ONE OR MORE MOLDS WITH A MOLDING RESIN OR OTHER SIMILAR LIQUIDS LIKELY TO BE MOLDED |
EP0077847A1 (en) * | 1981-10-28 | 1983-05-04 | Rolf Ditter | Injection-moulding apparatus for injection-moulding machines and/or injection-moulding tools |
FR2523506A1 (en) * | 1982-03-19 | 1983-09-23 | Emhart Ind | INJECTION MOLDING ASSEMBLY |
EP0656251A1 (en) * | 1992-06-30 | 1995-06-07 | KRUPP CORPOPLAST MASCHINENBAU GmbH | Method and apparatus for manufacturing objects from thermoplastic material by injection moulding |
DE4224196A1 (en) * | 1992-07-17 | 1994-01-20 | Mannesmann Ag | Method and device for pressing injection molding compounds |
Also Published As
Publication number | Publication date |
---|---|
DE2639155A1 (en) | 1977-04-07 |
FR2325490B1 (en) | 1979-03-30 |
NL7610245A (en) | 1977-03-29 |
BE846589A (en) | 1977-03-24 |
LU75874A1 (en) | 1977-05-06 |
DK383876A (en) | 1977-03-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
ST | Notification of lapse |