GB556743A - Improvements in or relating to the production of optical lenses and other mouldings in plastics - Google Patents

Improvements in or relating to the production of optical lenses and other mouldings in plastics

Info

Publication number
GB556743A
GB556743A GB347442A GB347442A GB556743A GB 556743 A GB556743 A GB 556743A GB 347442 A GB347442 A GB 347442A GB 347442 A GB347442 A GB 347442A GB 556743 A GB556743 A GB 556743A
Authority
GB
United Kingdom
Prior art keywords
preform
moulding
dies
radius
die
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
GB347442A
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 GB347442A priority Critical patent/GB556743A/en
Publication of GB556743A publication Critical patent/GB556743A/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
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00932—Combined cutting and grinding thereof
    • 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
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

556,743. Moulding lenses, prisms &c., from transparent thermoplastic materials; electric heating; pliers. KINGSTON, A. W. March 16,1942, Nos. 3474/42 and 427/43. [Class 87 (ii)] [Also in Groups XI and XXIII] The workpiece which is to be moulded is preformed by cutting, grinding or like mechanical operations to a shape closely approximating its final shape, and the preform is then moulded between dies. Before moulding the preform may be polished. The preform may be made by cutting a blank from a sheet, turning the blank to a curved surface by means of a cutter in a lathe, and grinding the curved surface, the resulting preform being polished on a rotary buffing machine. The moulding dies and the preform may be of such relative shapes that during the moulding free outlet for air is allowed towards the periphery of the die parts ; thus, the radius of curvature of a convex preform may be slightly less than the radius of curvature of the corresponding die surface, and the radius of a concave preform slightly greater than the. radius of the corresponding die surface. The thermoplastic material may be methyl methacrylate polymer, polystyrene or polyvinyl chloride. The preforms are preheated by being gripped in tongs 27 and inserted into a rheostatcontrolled electric oven 23 mounted on a frame near a moulding press 13. The heated preform is then placed on the lower die 12 which is raised by hydraulic means so that the preform is compressed between the dies 12, 15. At this stage, the dies are heated by contact with jackets 11, 16 connected to steam conduits 20, 22. After moulding, the steam is turned off and the jackets are cooled by means of cold water conduits 19, 21. During cooling, pressure is maintained on the moulded article by means of a spring 18. When the press is opened, the bottom die 12 is lifted out of its surround 10 by means of a pivoted hand-lever 33 connected to the die by a yoke 31 and rod 30. Specifications 416,398, [Group XX], and 544,472 are referred to.
GB347442A 1942-03-16 1942-03-16 Improvements in or relating to the production of optical lenses and other mouldings in plastics Expired GB556743A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB347442A GB556743A (en) 1942-03-16 1942-03-16 Improvements in or relating to the production of optical lenses and other mouldings in plastics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB347442A GB556743A (en) 1942-03-16 1942-03-16 Improvements in or relating to the production of optical lenses and other mouldings in plastics

Publications (1)

Publication Number Publication Date
GB556743A true GB556743A (en) 1943-10-20

Family

ID=9759007

Family Applications (1)

Application Number Title Priority Date Filing Date
GB347442A Expired GB556743A (en) 1942-03-16 1942-03-16 Improvements in or relating to the production of optical lenses and other mouldings in plastics

Country Status (1)

Country Link
GB (1) GB556743A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836960A (en) * 1987-10-05 1989-06-06 Sola Usa, Inc. Fabrication of thermoplastic optical components by injection/compression molding
WO2004060216A3 (en) * 2002-12-20 2004-12-29 Bausch & Lomb Apparatus and method for cutting an intraocular lense from a blank

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836960A (en) * 1987-10-05 1989-06-06 Sola Usa, Inc. Fabrication of thermoplastic optical components by injection/compression molding
WO2004060216A3 (en) * 2002-12-20 2004-12-29 Bausch & Lomb Apparatus and method for cutting an intraocular lense from a blank

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