Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1997-04-04
1999-09-07
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Changing mold size or shape during molding or with shrinkage...
2643287, 425808, B29D 1100
Patent
active
059483270
ABSTRACT:
In an injection step, actual injection speed V is closed-controlled so that the actual injection speed V becomes equal to first or second preset speed V.sub.1 or V.sub.2 while comparing the actual injection speed V with the first or second preset speed V.sub.1 or V.sub.2 in the section between S.sub.0 and S.sub.1 from the time when injection of molten resin is started up to the time when the molten resin reaches this side of a gate portion 46 or the section between S.sub.1 and S.sub.2 from the time when the molten resin reaches this side of the gate portion 46 up to the time when the molten resin reaches the inside of a cavity 3. The injection speed V is open- controlled to third preset speed V.sub.3 in the section between S.sub.2 and S.sub.3 from the time when the molten resin reaches the inside of the cavity 3 up to the time when injection of the molten resin is completed. Because a high injection speed can be secured and an injection speed change can be decreased, it is possible to decrease the frequency of a feed history appearing on the surface of a molded product.
REFERENCES:
patent: 4184835 (1980-01-01), Talbot
patent: 4364878 (1982-12-01), Laliberte et al.
patent: 4828769 (1989-05-01), Maus et al.
patent: 4900242 (1990-02-01), Maus et al.
George Galic's letter to German Patent Agent dated Nov. 10, 1997 (2 pages); including an Affidavit to the European Patent Office dated Nov. 7, 1997 (7 pages).
SPIE-The International Society for Optical Engineering Reprinted from Ophthalmic Lens Design and Fabrication vol. 1529--Dated Jul. 25-26, 1991 (pp. 13-21) Improved Plastic Molding Technology For Ophthalmic Lens & Contact Lens by George Galic and Steve Maus.
Optical World; Injection-compression moulding of Rx polycarbonate lenses by George Galic (4 pages).
Engel Information; Sandwich Press Injection (10 pages).
Asami Hiroshi
Saito Kiyohiro
Hoya Corporation
Vargot Mathieu D.
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