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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 shot

Info

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
Application number
FR7529669A
Other languages
French (fr)
Other versions
FR2325490B1 (en
Inventor
Jean-Pierre Quinet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Creusot Loire SA
Original Assignee
Creusot Loire SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Creusot Loire SA filed Critical Creusot Loire SA
Priority to FR7529669A priority Critical patent/FR2325490A1/en
Priority to DK383876A priority patent/DK383876A/en
Priority to DE19762639155 priority patent/DE2639155A1/en
Priority to NL7610245A priority patent/NL7610245A/en
Priority to BE170942A priority patent/BE846589A/en
Priority to LU75874A priority patent/LU75874A1/xx
Publication of FR2325490A1 publication Critical patent/FR2325490A1/en
Application granted granted Critical
Publication of FR2325490B1 publication Critical patent/FR2325490B1/fr
Granted legal-status Critical Current

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.
FR7529669A 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 Granted FR2325490A1 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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
LU75874A1 (en) 1977-05-06
FR2325490B1 (en) 1979-03-30
DE2639155A1 (en) 1977-04-07
BE846589A (en) 1977-03-24
NL7610245A (en) 1977-03-29
DK383876A (en) 1977-03-27

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse