FR2380117A1 - Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket - Google Patents

Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket

Info

Publication number
FR2380117A1
FR2380117A1 FR7703937A FR7703937A FR2380117A1 FR 2380117 A1 FR2380117 A1 FR 2380117A1 FR 7703937 A FR7703937 A FR 7703937A FR 7703937 A FR7703937 A FR 7703937A FR 2380117 A1 FR2380117 A1 FR 2380117A1
Authority
FR
France
Prior art keywords
cavity
injection moulding
plastic lenses
overflow pocket
moulding plastic
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
FR7703937A
Other languages
French (fr)
Other versions
FR2380117B1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7703937A priority Critical patent/FR2380117A1/en
Publication of FR2380117A1 publication Critical patent/FR2380117A1/en
Application granted granted Critical
Publication of FR2380117B1 publication Critical patent/FR2380117B1/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
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • 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
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • 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
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B29C2045/563—Enlarging the mould cavity during injection
    • 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
    • B29C45/26—Moulds
    • B29C45/2669—Moulds with means for removing excess material, e.g. with overflow cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses

Abstract

The appts. includes a pair of cavity defining dies movable towards each other after injection and an overflow pocket adapted to receive the excess material forced from the cavity. During injection a relatively wide cavity can be maintained to enable easy flow of the material, obviating defects such as knit lines. Redn. of the cavity size enables thin lenses, both concave and convex to be formed. A lens can be formed which required no finishing operation, such as grinding.
FR7703937A 1977-02-11 1977-02-11 Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket Granted FR2380117A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7703937A FR2380117A1 (en) 1977-02-11 1977-02-11 Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7703937A FR2380117A1 (en) 1977-02-11 1977-02-11 Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket

Publications (2)

Publication Number Publication Date
FR2380117A1 true FR2380117A1 (en) 1978-09-08
FR2380117B1 FR2380117B1 (en) 1980-10-17

Family

ID=9186635

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7703937A Granted FR2380117A1 (en) 1977-02-11 1977-02-11 Injection moulding plastic lenses - in a cavity of reducible size having an overflow pocket

Country Status (1)

Country Link
FR (1) FR2380117A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432929A1 (en) * 1978-08-10 1980-03-07 Omnitech Inc METHOD AND APPARATUS FOR MOLDING PRECISION ARTICLES
FR2437286A1 (en) * 1978-09-28 1980-04-25 Gen Electric INJECTION AND COMPRESSION THERMOPLASTIC RESIN MOLDING APPARATUS
FR2513937A1 (en) * 1981-10-06 1983-04-08 Abramov Vsevolod Thermoplastics injection moulded with high holding pressure - and controlled heating at inlet and outlet openings to mould cavities
US4569807A (en) * 1982-07-16 1986-02-11 Essilor International Cie Generale D'optique Method and apparatus for molding optical components
FR2615783A1 (en) * 1987-05-28 1988-12-02 Yoshida Industry Co INJECTION MOLDED PRODUCT HAVING A PARTIALLY THIN PART AND METHOD AND APPARATUS FOR MANUFACTURING THE SAME
EP0366545A1 (en) * 1988-10-27 1990-05-02 ESSILOR INTERNATIONAL Compagnie Générale d'Optique Process for producing an ophthalmic lens from a disc of synthetic material
NL1004145C2 (en) * 1996-09-30 1999-09-28 Mitsubishi Materials Corp Pressure injection moulding machine including pair of dies and closure unit - lightly closed for injection against spring loading, to fill mould followed by increased closure pressure displacing moulding composition back into feed unit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432929A1 (en) * 1978-08-10 1980-03-07 Omnitech Inc METHOD AND APPARATUS FOR MOLDING PRECISION ARTICLES
FR2437286A1 (en) * 1978-09-28 1980-04-25 Gen Electric INJECTION AND COMPRESSION THERMOPLASTIC RESIN MOLDING APPARATUS
FR2513937A1 (en) * 1981-10-06 1983-04-08 Abramov Vsevolod Thermoplastics injection moulded with high holding pressure - and controlled heating at inlet and outlet openings to mould cavities
US4569807A (en) * 1982-07-16 1986-02-11 Essilor International Cie Generale D'optique Method and apparatus for molding optical components
FR2615783A1 (en) * 1987-05-28 1988-12-02 Yoshida Industry Co INJECTION MOLDED PRODUCT HAVING A PARTIALLY THIN PART AND METHOD AND APPARATUS FOR MANUFACTURING THE SAME
EP0366545A1 (en) * 1988-10-27 1990-05-02 ESSILOR INTERNATIONAL Compagnie Générale d'Optique Process for producing an ophthalmic lens from a disc of synthetic material
FR2638391A1 (en) * 1988-10-27 1990-05-04 Essilor Int METHOD FOR FORMING AN OPHTHALMIC LENS FROM A PALLET OF SYNTHETIC MATERIAL
US5100590A (en) * 1988-10-27 1992-03-31 Essilor International Cie Generale D'optique Method of forming an opthalmic lens from a synthetic material blank
NL1004145C2 (en) * 1996-09-30 1999-09-28 Mitsubishi Materials Corp Pressure injection moulding machine including pair of dies and closure unit - lightly closed for injection against spring loading, to fill mould followed by increased closure pressure displacing moulding composition back into feed unit

Also Published As

Publication number Publication date
FR2380117B1 (en) 1980-10-17

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Legal Events

Date Code Title Description
TP Transmission of property
CD Change of name or company name
ST Notification of lapse