FR2058811A5 - Injection mould cavities dilated by wedge cams - Google Patents

Injection mould cavities dilated by wedge cams

Info

Publication number
FR2058811A5
FR2058811A5 FR6932976A FR6932976A FR2058811A5 FR 2058811 A5 FR2058811 A5 FR 2058811A5 FR 6932976 A FR6932976 A FR 6932976A FR 6932976 A FR6932976 A FR 6932976A FR 2058811 A5 FR2058811 A5 FR 2058811A5
Authority
FR
France
Prior art keywords
plugs
cavity
dilated
injection mould
mould cavities
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
Application number
FR6932976A
Other languages
French (fr)
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.)
Societe de Signalisations Automobiles SEIMA
Original Assignee
Societe de Signalisations Automobiles SEIMA
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 Societe de Signalisations Automobiles SEIMA filed Critical Societe de Signalisations Automobiles SEIMA
Priority to FR6932976A priority Critical patent/FR2058811A5/en
Application granted granted Critical
Publication of FR2058811A5 publication Critical patent/FR2058811A5/en
Expired 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
    • B29C44/428—Mould constructions; Mould supporting equipment

Landscapes

  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

A mould with moving plugs in the top and/or bottom of each mould cavity has the plugs mounted on wedge shaped plates which reciprocate due to complementary wedge plates moving at right angles to the expansion axis. Melt is injected into an undersize cavity and the plugs are subsequently allowed to retract until the cavity is full size under conditions which allow the initial shot to expand. Reduced cycle times are obtained cf. compression moulding.
FR6932976A 1969-09-26 1969-09-26 Injection mould cavities dilated by wedge cams Expired FR2058811A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR6932976A FR2058811A5 (en) 1969-09-26 1969-09-26 Injection mould cavities dilated by wedge cams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6932976A FR2058811A5 (en) 1969-09-26 1969-09-26 Injection mould cavities dilated by wedge cams

Publications (1)

Publication Number Publication Date
FR2058811A5 true FR2058811A5 (en) 1971-05-28

Family

ID=9040689

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6932976A Expired FR2058811A5 (en) 1969-09-26 1969-09-26 Injection mould cavities dilated by wedge cams

Country Status (1)

Country Link
FR (1) FR2058811A5 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2168534A1 (en) * 1972-01-21 1973-08-31 Pirelli

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2168534A1 (en) * 1972-01-21 1973-08-31 Pirelli

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Legal Events

Date Code Title Description
GC Lien (pledge) constituted
ST Notification of lapse
GC Lien (pledge) constituted