Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1995-10-05
1998-01-13
Czaja, Donald E.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 81, 65261, 65263, 65300, C03B 914
Patent
active
057074135
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
1. Technical Field
The invention relates to a method and an apparatus for producing a hollow glass article, such as, a bulb for an electric lamp, a glass shell for a mercury lamp, vessels for physics and chemical purpose, e.g., beakers or flasks, tableware, e.g., tumblers or teapots, and inner glass-bins for vacuum bottles.
2. Prior Art
Conventionally, when a hollow glass article is produced using a blowing machine, a predetermined volume of molten glass, intermittently supplied from a feeder disposed adjacent to a glass melting furnace, is formed into a disk-shaped configuration. The molten glass of a disk-shaped configuration is sequentially supplied onto a plurality of support rings equidistantly disposed around a turn table of a blowing machine. Each support ring is rotated so as to cause a portion of the molten glass to hang down through a circular hole in the support ring. The molten glass is then introduced into a mold. A quantity of air is blown into the molten glass in the mold from a blow head, so as to produce a hollow glass article of a desired configuration. The thus resulting hollow glass article is connected with an annular moil on the support ring which has been stopped at a predetermined rotational position. Thus, it is necessary to sever the moil in order to remove or unload the resultant hollow glass article.
With the prior art method for producing a hollow glass article, a quantity of glass powder is produced during severing the moil. Such glass powder tends to be fallen into inside of the hollow glass article just after a blow molding operation. This needs washing or cleaning operation at a subsequent stage. In some cases, the glass powder is melt and adhered to the hollow glass article, so as to cause unacceptable article. A device for rotating a support ring of a considerable weight and for accurately positioning it at its rotational position is also required.
SUMMARY OF THE INVENTION
Under the circumstances, it is an object of the invention to provide a method and an apparatus for producing a hollow glass article which permits removal of the hollow glass article without severing a moil, which prevents occurrence of glass powder which might be otherwise caused during severing the moil, and which may obviate a particular device for positioning the blow head and for stooping it at a rotational position.
In order to achieve the above object, the first method for producing a hollow glass article comprises the steps of: supplying a quantity of molten glass of a disk-shaped configuration onto a support ring; lowering a blow head toward the support ring so as to permit the quantity of molten glass on the support ring to be held by its periphery by means of the blow head; withdrawing the support ring from the blow head when the quantity of molten glass has been held by the blow head; supplying a quantity of air into the molten glass from the blow head, so as to form a hollow glass article by means of a blow-molding operation; and eliminating the holding ability of the blow head relative to the hollow glass article so as to remove the hollow glass article from the blow head.
The second method according to the invention comprises the steps of: supplying a quantity of molten glass of a disk-shaped configuration to a position below a blow head; lowering the blow head so as to permit the quantity of molten glass to be held by its periphery by means of the blow head; supplying a quantity of air into the molten glass from the blow head, so as to form a hollow glass article by means of a blow-molding operation; and eliminating the holding ability of the blow head relative to the hollow glass article so as to remove the hollow glass article from the blow head.
A first apparatus of the invention comprises a plurality of support rings equidistantly disposed around a turn table for receiving a quantity of molten glass formed into a disk-shaped configuration, the support rings being adapted to be withdrawn by means of a withdrawing means; and a plurality of blow heads disposed around the t
REFERENCES:
patent: 2020031 (1935-11-01), Kadow
patent: 2225948 (1940-12-01), Beatty
patent: 2348347 (1944-05-01), Koob
patent: 2669806 (1954-02-01), Van de Walle et al.
patent: 3195996 (1965-07-01), Tingley
patent: 4289523 (1981-09-01), Murakawa et al.
Czaja Donald E.
Nippon Electric Glass Co. Ltd.
Vincent Sean
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